1. (n.) A professional partner or associate\ in some civil or ecclesiastical office. It is seldom used of partners in trade or manufactures.

2. (v. t & i.) To unite or associate with another or with others.

ace adjunct aide ally amigo assistant associate bedfellow bedmate bosom buddy brother brother-in-arms buddy bunkie bunkmate butty camarade chamberfellow chum classmate co-worker coadjutor cohort comate companion company compatriot compeer comrade confederate confrere consociate consort copartner crony fellow fellow member fellow student girl friend gossip helper mate messmate old crony pal pard pardner partner playfellow playmate roommate schoolfellow schoolmate shipmate side partner sidekick teammate workfellow yokefellow yokemate